Medium Voltage Iron Core Oil-Immersed Shunt Reactor

Iron core Oil-immersed Shunt Reactors act as an absorber of reactive power to increase energy efficiency of the power system.

Shunt Reactors are used in order to compensate capacitive reactive power generated by long and lightly loaded transmission lines as well as underground cables, thus allowing the flow of more active power through the system and avoiding over voltages. Shunt Reactors can be directly connected to the power line or to a tertiary winding of a three-winding power or distribution transformer.

The main windings and the magnetic circuit are immersed in oil. The insulation oil acts as the cooling medium, which can both absorb heat from the reactor windings and conduct the heat away through the oil.

The core of an oil-immersed reactor is made of ferromagnetic materials, with one or more built-in air gaps. These air-gapped iron cores are designed to withstand not only the mechanical stresses during normal operation but also to withstand the fault conditions in the network.

In high power and high voltage systems, shunt reactors should be used with RC snubber filters due to the fact that in such systems switching transient voltages are extremely high and the switching devices may get damaged without proper damping measures.


Typical Applications


It is mainly used for reactive power compensation of long or lightly loaded transmission lines as well as underground cables used in:

  • Wind Farms
  • Subways (Metro)
  • Urban Distribution Systems
  • Industrial Zones
  • University Campuses
  • Substations


Technical Specification
Voltage Up to 36 kV
Power Up to 5 MVAr *
Type Oil-immersed
Frequency 50 Hz / 60 Hz
Winding Aluminium or copper winding
Painting RAL 7035 or other colors on demand
Temperature -30°C to 55°C
Insulation class A class or custom
Cooling ONAN, ONAF
Standards IEC 60076-6, IEEE Std. C57.21

- Taps

- Enclosure

- Complete solution with CBs, snubber circuit and protection relay

- Thermometer

- Oil level indicator

- Silicagel

- Other accessories on demand

*Consult factory for higher values.